Enabling one step loading operation using linkage-weight system of 20 kN force standard machine

The loading frame lifting mechanism of the 20 kN dead-weight type force standard machine was improved to enable the one step loading operation at the first force step. This modification was achieved by adding a reduction gear to amplify the output torque of the motor driving the loading frame. The one step loading operation allows the evaluation of the time-dependent characteristics of force transducers, and also improves the working efficiency. Some force measuring devices showed a little change of sensitivity upon applying the one step loading operation. It was found that the degree of time dependence in the characteristics of the three force measuring devices examined in this study had only a small impact on the measurement uncertainty.